Update Process Very Slow in Oracle 8 which update bulk data

Dear all
i am just updating data through SQLsub-query,but i want to get to column from sub-query and need to update my source table, but there is problem is that through sub-query just return a single column while updating,but i don't wan't to re-type another query for another column due to performance issue.
Also the other issued related performance is very slow,how should i fast update in bulk.
Please suggest,
Thanks

Actually i am update time roster table with machine date, first i get from file & insert into Machine_table & then
i make joing query & then update roster table which is like below.
in roster table data consist 1 to last day of month of every employee.
update roster a
set (a.timein,a.timeout) = (select timein,timeout from machine_table mch
where a.roster_date = mch.roster_date and a.person_id = mch.person_id);
this query is updating around 7750 & it takes to much time.
please help urgent thanks.

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